(3S)-3-[[(2S,3S)-1-[(2S)-2-acetamido-3-(1H-indol-3-yl)propanoyl]-3-methylsulfanylpyrrolidine-2-carbonyl]amino]-4-[[(2S)-1-amino-1-oxo-3-phenylpropan-2-yl]amino]-4-oxobutanoic acid
(3S)-3-[[(2S,3S)-1-[(2S)-2-acetamido-3-(1H-indol-3-yl)propanoyl]-3-methylsulfanyl-pyrrolidine-2-carbonyl]amino]-4-[[(1S)-2-amino-2-oxo-1-(phenylmethyl)ethyl]amino]-4-oxo-butanoic acid
(3S)-3-[[[(2S,3S)-1-[(2S)-2-acetamido-3-(1H-indol-3-yl)-1-oxopropyl]-3-(methylthio)-2-pyrrolidinyl]-oxomethyl]amino]-4-[[(1S)-2-amino-2-oxo-1-(phenylmethyl)ethyl]amino]-4-oxobutanoic acid
(3S)-3-[[(2S,3S)-1-[(2S)-2-acetamido-3-(1H-indol-3-yl)propanoyl]-3-(methylthio)pyrrolidine-2-carbonyl]amino]-4-[[(1S)-2-amino-1-(benzyl)-2-keto-ethyl]amino]-4-keto-butyric acid
(3S)-3-[[(2S,3S)-1-[(2S)-2-acetamido-3-(1H-indol-3-yl)propanoyl]-3-methylsulfanyl-pyrrolidin-2-yl]carbonylamino]-4-[[(2S)-1-amino-1-oxo-3-phenyl-propan-2-yl]amino]-4-oxo-butanoic acid